Disclaimer: The equations on the D2 RigCalc site are intended for professional riggers who understand them and know how to interpret the results.  Delbert L. Hall and D2 Flying Effects make no claims or warranties about the accuracies of the results from these equations.  Anyone using these pages accepts full responsibility for how they use the results and agrees to hold Delbert L. Hall and D2 Flying Effects harmless for any errors or results of any errors that may result from the use of these equations.